Abstract
DRONC is an apical Drosophila caspase essential for programmed cell death during fly development. During metamorphosis, dronc gene expression is regulated by the steroid hormone ecdysone, which also regulates the levels of a number of other critical cell death proteins. As DRONC protein levels are important in determining caspase activation and initiation of cell death, we have analyzed the regulation of the dronc promoter using transgenic flies expressing a LacZ reporter gene under the control of the dronc promoter. Our results indicate that dronc expression is highly dynamic during Drosophila development, and is controlled both spatially and temporally. We demonstrate that while a 2.3 kb dronc promoter region contains most of the information required for correct gene expression, a 1.1 kb promoter region is expressed in some tissues and not others. We further demonstrate that during larval–pupal metamorphosis, two ecdysone-induced transcription factors, Broad-Complex and E93, are required for correct dronc expression. Our data suggest that the dronc promoter is regulated in a highly complex manner, and provides an ideal system to explore the temporal and spatial regulation of gene expression driven by nuclear hormone receptors.
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Abbreviations
- PCD:
-
programmed cell death
- β-gal:
-
β-galactosidase
- CPRG:
-
chlorophenol red β-d-galactopyranoside
- X-gal:
-
5-bromo-4-chloro-3-indolyl-β-d-galactoside
- AEL:
-
after egg laying
- L2:
-
second instar larvae
- L3:
-
third instar larvae
- PP:
-
prepupae
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Acknowledgements
This work was supported by the National Health and Medical Research Council of Australia. TJD was supported by a Dawes Postgraduate Award from the Royal Adelaide Hospital. We are grateful to Eric Baehrecke, Carl Thummel, and Drosophila Stock Center for fly stocks.
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Daish, T., Cakouros, D. & Kumar, S. Distinct promoter regions regulate spatial and temporal expression of the Drosophila caspase dronc. Cell Death Differ 10, 1348–1356 (2003). https://doi.org/10.1038/sj.cdd.4401312
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DOI: https://doi.org/10.1038/sj.cdd.4401312
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